/*
 * Copyright (c) 2011, Marc-Andre Ferland - madrang@gmail.com
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the The Warrent Team nor the
 *       names of its contributors may be used to endorse or promote products
 *       derived from this software without specific prior written permission.
 *     * This software is free for non-commercial use. You may not use this
 *       software, in whole or in part, in support of any commercial product
 *       without the express consent of the author.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE WARRENT TEAM BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
using System;
using System.Runtime.InteropServices;

namespace OsHelper.UsbNet.Descriptors
{
	
	[StructLayout(LayoutKind.Explicit, Pack = 1, Size = 2)]
	public struct Descriptor
	{
		/// <summary>
		/// Total size of this structure in bytes.
		/// </summary>
		public static int Size {
			get { return Marshal.SizeOf(typeof (Descriptor)); }
		}
		
		[FieldOffsetAttribute(0)]
		public byte Length;
		
		[FieldOffsetAttribute(1)]
		public UsbNet.Descriptors.DescriptorType Type;
		
		public byte[] ToBytes()
		{
			return Serialyser.RawSerialize(this);
		}
		
		public static Descriptor FromBytes(byte[] Data)
		{
			if(Data == null)
				throw new ArgumentNullException("Data");
			
			if(Data.Length < Descriptor.Size)
				throw new ArgumentException();
			
			if(Data.Length == Descriptor.Size)
				return (Descriptor)OsHelper.Serialyser.RawDeserialize(Data, typeof(Descriptor));
		
			byte[] DescData = new byte[Descriptor.Size];
			Array.Copy(Data, 0, DescData, 0, Descriptor.Size);
			return (Descriptor)OsHelper.Serialyser.RawDeserialize(DescData, typeof(Descriptor));
		}
		
	}
}
